The act of Raping someones Facebook profile when they leave it logged in. Profile pictures, sexuality and interests are commonly changed however fraping can include the poking or messaging of strangers from someone else's Facebook account.

Dude, did you see Jonny's Facebook profile, someone fraped him big time.

Facebook-rape. Where you accidentally leave your facebook logged in while your friends change all of your details to comically misleading things or add you to all of the penis-related groups on Facebook

A combination of the words "Facebook" and "rape". It means someone has left their account logged in, so someone "frapes" them by posting embarrassing things on behalf of the victim. I never understood why rape has to come into the equation, seeing as rape is a much more serious and damaging thing than pretending to be someone else online.

Guy 1: hueheuheuheuheueheuh just fraped some1
Guy 2: really? do you have to call it that?

John: You ever had a frape(s)?
Super hotty from next door: no
John: Here have one!
Super hotty from next door: Omg john its frozen and juicy!
John: Ur hot!
Super hotty from next door: I know, i want u!